CVE-2026-25210Disclosure(libexpat_project / libexpat)

LOWCVSS 7.8 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Patch libexpat_project libexpat systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

In libexpat before 2.7.4, the doContent function does not properly determine the buffer size bufSize because there is no integer overflow check for tag buffer reallocation.

0.8/ 10 priority

Sources & remediation

Weakness type (CWE)
CWE-190

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • libexpat

Threat summary

  • Patch or workaround signal is available
  • 10 mentions across 8 observed days
  • Momentum state: stable

What's happening

  • Patch or workaround mentioned in 5 signals
  • Technical details provided in 8 signals
  • Disclosure: 5 classified signals
  • Peaked 7d ago at 2 mentions (2026-01-30); latest day: 1
  • 10 total mentions across 8 days

Affected systems

Products
libexpat

Deep dive

Activity timeline10 mentions / 8d
01122Mentions · 2026-01-30: 2Mentions · 2026-02-08: 1Mentions · 2026-02-11: 2Mentions · 2026-02-20: 1Mentions · 2026-02-24: 1Mentions · 2026-02-27: 1Mentions · 2026-03-04: 1Mentions · 2026-06-27: 1Patch / Workaround · 2026-02-08: 1Patch / Workaround · 2026-02-11: 1Patch / Workaround · 2026-02-24: 1Patch / Workaround · 2026-02-27: 1Patch / Workaround · 2026-03-04: 1Technical Details · 2026-01-30: 2Technical Details · 2026-02-08: 1Technical Details · 2026-02-11: 2Technical Details · 2026-02-20: 1Technical Details · 2026-02-27: 1Technical Details · 2026-03-04: 101-3002-0802-1102-2002-2402-2703-0406-27
Signal classification2 categories
Disclosure
550.0%
Patch
550.0%
Referenced assets9 URLs
Classification over time
DateTotalLabels
2026-01-302
Disclosure2
2026-02-081
Patch1
2026-02-112
Disclosure1Patch1
2026-02-201
Disclosure1
2026-02-241
Patch1
2026-02-271
Patch1
2026-03-041
Patch1
2026-06-271
Disclosure1
Full discourse10 posts
  • Open Source Security mailing list@oss_security
    Patch

    libexpat 2.7.4 fixes 2 CVEs https://www.openwall.com/lists/oss-security/2026/01/31/1 CVE-2026-24515 NULL pointer dereference CVE-2026-25210 Integer overflow

    Post summary

    The post announces that libexpat version 2.7.4 includes a patch fixing CVE-2026-24515 (NULL pointer dereference) and CVE-2026-25210 (Integer overflow) with no evidence of active exploitation or PoC.

    030101848
    4.4K followersView on X
  • Security Bug Aggregator@BugsAggregator
    Disclosure

    [492812194] Vulnerability: CVE-2026-25210 affecting GitOnBorg::chromium::chromium::src http://crbug.com/492812194

    Post summary

    The post announces CVE‑2026‑25210 affecting Chromium source and links to a Crbug issue, but provides no further technical detail, PoC, or exploit information.

    00061626
    3.5K followersView on X
  • koraycodes@koraycodes
    Patch

    Memory safety is non-negotiable for high-performance systems. 🧠 The bundled libexpat library is upgraded to 2.7.4. Fixes for CVE-2026-24515 and CVE-2026-25210 prevent memory amplification and crashes during XML parsing. A critical "use-after-free" bug in the ssl module has been neutralized. 🔒

    Post summary

    The update to libexpat 2.7.4 includes patches for CVE-2026-24515 and CVE-2026-25210, mitigating memory amplification and XML parsing crashes, while also neutralizing a critical use‑after‑free bug in the ssl module.

    1000040
    790 followersView on X
  • Ferramentas Linux@Cezar_H_Linux
    Patch

    Urgent: #SUSE Linux Micro 6.1 patches Expat library with fixes for CVE-2026-24515 (NULL dereference) and CVE-2026-25210 (integer overflow). Read more: 👉 https://tinyurl.com/ya558teh #Security https://t.co/8Iy2xUVJbT

    Post summary

    The tweet announces that SUSE Linux Micro 6.1 has released patches addressing CVE-2026-24515 (NULL dereference) and CVE-2026-25210 (integer overflow).

    0000056
    1.3K followersView on X
  • Lambda Watchdog@LambdaWatchdog
    Patch

    🔍 Lambda Watchdog detected that CVE-2026-25210 is no longer present in latest AWS Lambda base image scans. https://github.com/aws/aws-lambda-base-images/issues/425 #AWS #Lambda #Security #CVE #DevOps #SecOps

    Post summary

    AWS Lambda base images have been updated to remove CVE-2026-25210, indicating the vulnerability has been patched.

    0000061
    30 followersView on X
  • Lambda Watchdog@LambdaWatchdog
    Disclosure

    🚨 New MEDIUM CVE detected in AWS Lambda 🚨 CVE-2026-25210 impacts expat in 7 Lambda base images. Details: https://github.com/aws/aws-lambda-base-images/issues/425 More: https://lambdawatchdog.com/ #AWS #Lambda #CVE #CloudSecurity #Serverless

    Post summary

    The tweet announces a new Medium‑severity CVE (CVE‑2026‑25210) that affects expat in several AWS Lambda base images, with links for more details.

    0000027
    30 followersView on X
  • ThreatCluster@threatcluster
    Disclosure

    Expat XML parser flaws in Ubuntu 25.10, 22.04 LTS and older allow DoS or possible code execution via crafted XML, impacting xmltok (CVE-2025-59375, CVE-2026-24515, CVE-2026-25210). #Linux https://threatcluster.io/cluster/critical-expat-vulnerabilities-affect-multiple-ubuntu-releas-7b8a8fa0

    Post summary

    The tweet announces Expat XML parser vulnerabilities (CVE‑2025‑59375, CVE‑2026‑24515, CVE‑2026‑25210) affecting Ubuntu, noting DoS and potential code execution via crafted XML, without providing PoC, exploit, or patch details.

    0000058
    79 followersView on X
  • Ferramentas Linux@Cezar_H_Linux
    Patch

    USN-8023-1: libxmltok flaws (CVE-2026-24515 & CVE-2026-25210) are now public. Key takeaway: CVE-2026-25210 = Integer Overflow → Heap Overflow → Potential RCE. ⚠️ Patches ONLY in #Ubuntu Pro/ESM repos. Read more: 👉 https://tinyurl.com/fd6dsmfu #Security https://t.co/JR4e8Mh9LR

    Post summary

    The Ubuntu Security Notice announces CVE-2026-25210 as a potential RCE via an integer overflow and indicates that patches are available only in Ubuntu Pro/ESM repositories.

    0000066
    1.3K followersView on X
  • Vulmon Vulnerability Feed@VulmonFeeds
    Disclosure

    CVE-2026-25210 Integer Overflow Vulnerability in Libexpat XML Parser Before 2.7.4 https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-25210

    Post summary

    The text announces an integer overflow vulnerability in libexpat versions prior to 2.7.4, but does not provide a PoC, exploit, or patch information.

    0000074
    4.0K followersView on X
  • CVE@CVEnew
    Disclosure

    CVE-2026-25210 In libexpat before 2.7.4, the doContent function does not properly determine the buffer size bufSize because there is no integer overflow check for tag buffer realloc… https://www.cve.org/CVERecord?id=CVE-2026-25210

    Post summary

    The statement reveals a buffer overflow risk in libexpat before version 2.7.4 due to a missing integer overflow check during tag buffer reallocation.

    00000213
    56.5K followersView on X
CPE platform detail1 entries

1 of 1 entries

PartVendorProductVersionTarget SWTarget HW
Applibexpat_projectlibexpat---

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